JP2009045877A - プラスチックボトル成形用プリフォーム - Google Patents
プラスチックボトル成形用プリフォーム Download PDFInfo
- Publication number
- JP2009045877A JP2009045877A JP2007215537A JP2007215537A JP2009045877A JP 2009045877 A JP2009045877 A JP 2009045877A JP 2007215537 A JP2007215537 A JP 2007215537A JP 2007215537 A JP2007215537 A JP 2007215537A JP 2009045877 A JP2009045877 A JP 2009045877A
- Authority
- JP
- Japan
- Prior art keywords
- preform
- support ring
- thickness
- plastic bottle
- thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/08—Injection moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Manufacturing & Machinery (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
【解決手段】プラスチックボトル成形用プリフォームは、口栓部、サポートリング、胴部及び胴部の端部を閉塞する底部を備える。樹脂重量は21.0g以下であり、プリフォームの全長を92.5mmより小さくし、胴径を24.0mmより小さくし、サポートリングの下に最小肉薄部からなる長さ5〜10mmのサポートリング下肉薄部を設け、更に胴部の肉厚をサポートリング下肉薄部より厚くし、且つ底部はゲート部のほうに向けて徐々に肉厚を薄くした。
【選択図】 図1
Description
しかし、プラスチックボトルの軽量化を行う場合、プリフォームの最大肉厚は薄くならざるを得ない。プリフォームの最大肉厚が薄くなった場合、ブロー成形時に、プリフォームの最大肉厚部が延伸されやすくなり、ボトル胴部が肉薄になる。したがって、プリフォームの外形状を変更せずにプリフォームを軽量化する場合、プリフォームを薄くした場合にも延伸されやすいプリフォームのサポートリングの下のサポートリング下肉薄部及び底部の形状が求められる。このことは、重量を26gからさらに軽量化を図るとき、特に求められる。
但し、プリフォームを射出成形する際の金型構造上、抜きテーパ開始位置径を14.0mm以上にすることが望ましいことから、抜きテーパ開始位置径は、14.0〜26.0mmとすることが望ましい。
また、プリフォーム搬送時に、プリフォーム同士が重なり動かなくなることを防止するため、抜きテーパ開始径は、プリフォームの口栓部内径に対し、0.4mm以上大きいことが必要となる。
先ず140〜150℃に加熱した金型に本発明のプリフォーム1をセットし、プリフォーム1を延伸ロッドで上方に延伸させながらプリフォーム内にブロー口からエアブローする。その後、金型にてヒートセットするために数秒間保持し、成形したものの中にエアを吹き込み冷却し、同時にブロー口から排気される。次いで金型を開き製品を取り出す。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 7.5mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.2mm
ゲート部肉厚 2.5mm
プリフォーム重量 20.5g
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 5.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.50mm
プリフォーム重量 20.6g
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 10.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.35mm
プリフォーム重量 20.4g
ポリエチレンテレフタレートの射出成形により、図1に示す形状で、下記の寸法を有するプリフォームを製造した。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 3.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.50mm
プリフォーム重量 20.7g
ポリエチレンテレフタレートの射出成形により、図1に示す形状で、下記の寸法を有するプリフォームを製造した。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 12.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.35mm
プリフォーム重量 20.3g
2 口栓部
3 サポートリング
4 サポートリング下肉薄部
5 胴部
6 底部
1a サポートリング下肉薄部の長さ
1b サポートリング下肉薄部の厚さ
1c サポートリング下から抜きテーパ開始位置までの長さ
1d 胴部の厚さ
1e 本発明のプリフォームの全長
1f 胴径
1g ゲート部肉厚
1h プリフォームの先端からサポートリング下までの長さ
1i サポートリング下の長さ
10 従来のプリフォーム
12 口栓部
13 サポートリング
14 サポートリング下肉薄部
15 胴部
16 底部
2a サポートリング下肉薄部の長さ
2b サポートリング下肉薄部の厚さ
2c サポートリング下から抜きテーパ開始位置までの長さ
2d 胴部の厚さ
2e 従来のプリフォームの全長
2f 従来のプリフォームの胴径
2g ゲート部肉厚
2h プリフォームの先端からサポートリング下までの長さ
2i サポートリング下の長さ
7 プラスチックボトル
Claims (3)
- 口栓部、サポートリング、胴部及び胴部の端部を閉塞する底部を備えるプラスチックボトル成形用プリフォームであって、樹脂重量が21.0g以下であり、プリフォームの全長を92.5mmより小さくし、胴径を24.0mmより小さくし、サポートリングの下に最小肉薄部からなる長さ5〜10mmのサポートリング下肉薄部を設け、更に胴部の肉厚をサポートリング下肉薄部より厚くし、且つ底部はゲート部のほうに向けて徐々に肉厚を薄くしたことを特徴とするプラスチックボトル成形用プリフォーム。
- プリフォームの全長は85.0mmであり、胴径は22.2mmであることを特徴とする請求項1に記載のプラスチックボトル成形用プリフォーム。
- サポートリング下肉薄部の肉厚を基準とすると、胴部の肉厚は当該サポートリング下肉薄部の肉厚の1.19〜1.9倍の厚さであり、ゲート部の肉厚を当該サポートリング下肉薄部の肉厚の0.85〜1.19倍の厚さであることを特徴とする請求項1又は2に記載のプラスチックボトル成形用プリフォーム。
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JP2020011420A (ja) * | 2018-07-17 | 2020-01-23 | 大日本印刷株式会社 | プリフォーム |
JP7205789B2 (ja) | 2018-07-17 | 2023-01-17 | 大日本印刷株式会社 | プリフォーム |
JP2022066384A (ja) * | 2018-07-17 | 2022-04-28 | 大日本印刷株式会社 | プリフォーム |
US11597556B2 (en) | 2018-07-30 | 2023-03-07 | Niagara Bottling, Llc | Container preform with tamper evidence finish portion |
JP2020196160A (ja) * | 2019-05-31 | 2020-12-10 | サントリーホールディングス株式会社 | プリフォームおよび容器成形方法 |
JP7158338B2 (ja) | 2019-05-31 | 2022-10-21 | サントリーホールディングス株式会社 | プリフォームおよび容器成形方法 |
WO2020241509A1 (ja) * | 2019-05-31 | 2020-12-03 | サントリーホールディングス株式会社 | プリフォームおよび容器成形方法 |
WO2023046582A3 (en) * | 2021-09-22 | 2023-05-11 | Société des Produits Nestlé S.A. | Method for manufacturing a bottle |
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